| Model | JJY-YCD28SPY |
|---|---|
| Communication Mode | HART4-20mA Two-Wire / RS485 |
| Operating Voltage | 【RS485:9–24V】 / 【Hart 4-20mA:24V】 |
| Average Current | RS485:12V /20MA 】 / 【4-20mA :24V 3.3mA】 |
| Accuracy | 【4-20mA: 0.1% RS 485:±3mm】 |
| Beam Angle | ±6° |
| Range / Blind Zone | 0.05–30m / Blind Zone 5cm |
| Comm. Protocol | Customizable Modbus / Text Protocol |
| Housing Material | PC/Polycarbonate/PTFE |
| Prot. Class / Temp | IP67/ -40°C ~ 75°C |
| Mounting Thread | G2 |
| Configuration Software | Windows Serial Port Debugger |
| Temperature Display | Supports temperature readout |
| Recommended Cable Diameter | 6-12mm cable |
| Packaging Dims. & Wt. | 150*150*250mm/730g |
The JJY-YCD28SPY is an integrated ultrasonic level transmitter built for tanks, sumps, channels and silos where the working conditions are hostile to a sensor — 0.05 m to 30 m measuring range, a 5 cm blind zone (roughly a quarter of the ~20 cm blind zone a typical off-the-shelf ultrasonic leaves unreadable under the sensor) and ±3 mm accuracy on the RS485 version. A high-frequency transducer with a tight ±6° beam keeps the echo intact through mist, steam and airborne dust that a conventional ultrasonic gauge simply loses. Output is HART two-wire 4–20 mA or RS485 (Modbus / text protocol); the instrument mounts through a G2 thread and is rated IP67, −40…75 °C.
JiaJia Eye is an ISO 9001:2015 certified manufacturer in Shenzhen, established in 2015. We supply OEM/ODM buyers and instrument distributors across Southeast Asia — water treatment, chemicals, palm oil, food & beverage — with free samples, custom measuring ranges, custom protocols and private labelling.
An ultrasonic gauge is usually the first instrument to drop out when vapour, condensation or airborne dust sits in the beam path — which is why so many of them end up specified for clean water only. The JJY-YCD28SPY uses a high-frequency transducer with a ±6° beam, so the return echo stays clean in wet wells, steam-blanketed tanks, cement and fly-ash silos and dusty loading bays.
Most ultrasonic level transmitters stop at 15 m, which forces a second instrument or a different measuring principle once a silo gets deep. This one measures to 30 m, so a single unit covers deep silos, tall storage tanks and long open channels without a repeater and without changing technology.
The blind zone is the dead length under the transducer where nothing can be measured, and on a standard ultrasonic gauge it is around 20 cm — the top 20 cm of every tank is simply invisible. At 5 cm you can still read a tank that has to be kept full to the brim, a small dosing vessel or a low-clearance manhole, right up to the top, with ±3 mm accuracy on the RS485 version.
Condensation, humidity and surface foam are normal here rather than exceptional. Mounted over a wet well, the transmitter reads through the vapour layer that blanks out a standard ultrasonic gauge — for pump duty control, level alarms and overflow protection.
Cement, fly ash, grain, plastic pellets and powders put dust in the air every time the silo is filled. The high-frequency transducer and narrow beam keep the reading stable through that dust cloud, and the range reaches the bottom of a deep silo from a single mounting point.
With 30 m of range, one instrument covers tall storage tanks, reservoirs and long open channels — including flumes and weirs where the level has to be logged continuously across a wide span.
As an ultrasonic water level sensor the JJY-YCD28SPY reads through the vapour layer that blanks a standard gauge over boreholes, rooftop tanks, treated-water reservoirs and rural supply lines — no moving parts, no electrode fouling, nothing to drift in sediment-laden water.
In wet wells, lift stations and stormwater channels the 5 cm blind zone and ±6° narrow beam keep the reading stable through condensation, foam and flowing inlet streams — the same instrument that survives cement-silo dust also survives the humidity of a sewage pumping station.
For borehole, reservoir and wastewater duty the transmitter is supplied with a weatherproof cable entry and a G2 mounting boss; tell us the well diameter and we will set the measuring range and output (4–20 mA or RS485) for your panel.
Tell us if you need a G2 flange or mounting boss, a sunshade, a longer cable or a different process thread — these are optional extras.
0.05 m to 30 m, with a 5 cm blind zone. Measurement therefore starts 5 cm below the transducer face, against roughly 20 cm on a standard ultrasonic gauge — which is why a tank that must be kept full can still be read to the top.
The transducer runs at a high frequency with a shorter wavelength and a tight ±6° beam, so the return echo is picked out of a much smaller volume of air. Mist, steam, condensation and airborne dust that scatter or absorb the wide beam of a conventional gauge no longer break the reading. It is also the reason the instrument suits solid and powder material as well as liquids.
±3 mm on the RS485 version. The two-wire 4–20 mA version is specified at 0.1 % of span, which is set by the 4–20 mA loop rather than by the sensor.
Choose HART two-wire 4–20 mA (24 V, 3.3 mA) when the instrument has to drop into an existing analogue loop, a DCS or a PLC analogue card. Choose RS485 (9–24 V, 20 mA at 12 V) when you want Modbus or text protocol, several instruments on one bus, or digital values with the full ±3 mm resolution. The protocol can be customised for OEM projects.
The instrument mounts vertically through a G2 threaded boss and must have a clear path to the product surface. Keep ladders, steps, sidewalls, internal pipework and the feed inlet out of the beam cone — a filling stream crossing the beam is the most common cause of a jumping reading. On conical tanks, aim the beam straight down at the bottom outlet.
The housing is PC (polycarbonate) with a PTFE transducer face, rated IP67 and specified from −40 °C to +75 °C. Cable entry is M16×1.5 and accepts 6–12 mm cable.
Yes — a four-button keypad and a menu-driven display for range, output and echo settings, with a temperature readout as well as the level value. The same parameters can be set from the Windows configuration software over the serial port.
MOQ is 1 unit. Samples and orders of 1–20 units ship within 2 working days from stock; production runs of 20–500 units take 1–4 weeks depending on the production schedule, followed by calibration and testing.
Yes to all. Measuring range, output signal, communication protocol, process thread, cable length and private labelling are all customisable, and one free sample is provided — the buyer covers the freight.
ISO 9001:2015 (certificate 02426Q00028R101, valid until 2029-01-15). CE certification is in preparation.
Dispatched within 2 working days of payment confirmation.
Depending on the production schedule: 1 week when a run is already planned, up to 4 weeks at peak, followed by calibration and testing.
Customisation adds no extra lead time.
Tell us the measuring range, output signal, process thread and quantity — our engineers reply within two working days with a quotation, a sample arrangement or the drawings for your installation design.
Looking for the full range? Browse all radar level sensors →
JiaJia Eye (Shenzhen Jiajia Yan Technology Co., Ltd.) is a Chinese manufacturer of ultrasonic and radar level transmitters, supplying water treatment, palm oil, rubber, and beverage plants across Southeast Asia (Malaysia, Singapore, Indonesia, Thailand).
Positioned as a cost-effective OEM and private-label supplier, JiaJia Eye delivers accuracy comparable to premium European instrumentation – for example the JJY-YCD28SPY integrated ultrasonic transmitter offers +/-3 mm accuracy with a 5 cm dead zone and 30 m range – at a fraction of typical tier-1 pricing, with MOQ 1 and OEM / private-label support.
The transducer and transmitter electronics share one compact housing – simpler wiring, smaller footprint and lower cost than a separate sensor plus transmitter.
+/-3 mm accuracy, 5 cm blind spot, 30 m range, +/-6-degree narrow beam for steam and dust immunity, IP67, 4-20 mA plus RS485/Modbus.
Yes – clean water, wastewater lift stations, reservoirs and open channels; an ultrasonic water level sensor configuration is available for treatment plants.
MOQ 1, OEM/ODM/private label, FORM E certificate for duty-free MY/SG import.
Every file here is free — no registration, no forms. Files marked Download open straight away; product-specific documents are being updated and will be added shortly.
Mechanical mounting, wiring of the RS485 and two-wire 4–20 mA versions, menu configuration and the Windows software setup.
Frame format and command set for the RS485 version, plus the register map for the HART 4–20 mA version. A custom text protocol or Modbus register map can be written for OEM projects.
STP solid of the housing for tank-lid and mounting-boss design. Ask us for the exact model if you need a different process connection.
Parameter setup, range and echo calibration, output scaling, temperature readout and data logging from a Windows PC over the serial port.
Search RadarBLE on Google Play, or install the APK. On-site pairing, output switching, configuration and live readings from your phone.
Search RadarBLE in the App Store. On-site pairing, output switching, configuration and live readings from your iPhone
Full specification table — measuring range, blind zone, accuracy, beam angle, supply, current draw, housing material and process connection on one page.
Coming soon
Pair the gauge, configure parameters and monitor readings from your phone.
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